US8313857B2 - Pouch type lithium secondary battery - Google Patents

Pouch type lithium secondary battery Download PDF

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Publication number
US8313857B2
US8313857B2 US12/054,752 US5475208A US8313857B2 US 8313857 B2 US8313857 B2 US 8313857B2 US 5475208 A US5475208 A US 5475208A US 8313857 B2 US8313857 B2 US 8313857B2
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United States
Prior art keywords
secondary battery
lithium secondary
electrode tabs
type lithium
pouch type
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US12/054,752
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US20090023062A1 (en
Inventor
Joongheong Kim
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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Assigned to SAMSUNG SDI CO., LTD. reassignment SAMSUNG SDI CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, JOONGHEON
Publication of US20090023062A1 publication Critical patent/US20090023062A1/en
Priority to US13/655,253 priority Critical patent/US8623547B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/045—Cells or batteries with folded plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • aspects of the present invention relate to a pouch type lithium secondary battery, and more particularly, to a pouch type lithium secondary battery that can minimize a size of a cell.
  • a lithium secondary battery uses a non-aqueous electrolyte because the lithium actively reacts with water.
  • the electrolyte may be a solid polymer containing lithium salts or a liquid in which the lithium salts are dissociated from an organic solvent.
  • the lithium secondary battery can be divided according to a kind of electrolyte used, i.e., lithium metal and lithium ion batteries, both of which use a liquid electrolyte, and lithium ion polymer batteries, which use a solid polymer electrolyte.
  • the lithium ion polymer battery can be divided into a complete solid type lithium ion polymer battery containing no organic electrolyte and a lithium ion polymer battery using a gel type polymer electrolyte containing an organic electrolyte.
  • a multi-layer film pouch can be used instead of a metal can as used in the lithium metal and lithium ion batteries.
  • the multi-layer film pouch may be formed of a metal foil and at least one polymer film covering the foil.
  • the weight of the secondary cell can be greatly reduced compared to the use of a metal can.
  • Aluminum is usually used as the metal forming the foil in the multi-layer film pouch.
  • the polymer film that forms an inner layer of the pouch film protects the metal foil from the electrolyte and prevents an electrical short between electrode tabs.
  • the pouch type lithium secondary battery may be formed by sealing an electrode assembly, which includes a cathode, a separator, and an anode stacked and/or wound, in a pouch. Then, the sealed pouch type bare cell is manufactured by bonding upper and lower pouch films to open peripheral parts by heating.
  • two electrode tabs connected to the electrode assembly extend from the electrode assembly to the outside of the pouch type bare cell.
  • a protection tape is provided to a portion where the two electrode tabs and pouch contact, thereby keeping the two electrode tabs insulated from the pouch during sealing.
  • a stepped part is formed for each electrode tab.
  • the stepped part has a width narrower than that of the protection tape at a sealing portion where the protection tape is provided in the pouch. In the stepped part, a region corresponding to the electrode tab is less pressurized. Thus, a possibility of the electrical short between the metal layer of the pouch and the electrode tabs becomes low and sealing pressure is substantially applied to the peripheral region of the stepped part, thereby improving the safety of the sealing.
  • the width of the battery in a longitudinal direction of a withdrawn surface of the electrode tab becomes gradually shorter.
  • a gap between the withdrawn electrode tabs becomes very narrow.
  • the electrode tab In the battery having a narrow gap between the electrode tabs, it is difficult to exactly set the electrode tab at a position where the stepped part is formed during a sealing process. Accordingly, when the electrode tab is not properly set at the stepped part-forming position, the electrode tab is electrically shorted or defects in sealing occur.
  • a pouch type lithium secondary battery can improve reliability of a product by stabilizing quality of a sealing portion of a pouch case where electrode tabs are withdrawn.
  • a pouch type lithium secondary battery can improve efficiency of a manufacturing process by improving workability of assembling and sealing process of the battery.
  • a pouch type lithium secondary battery which includes: an electrode assembly including electrode tabs respectively connected to two electrodes, the two electrodes having different polarities; and a case to house the electrode assembly such that the electrode tabs extend to the outside of the case, wherein one stepped part through which the two electrode tabs simultaneously extend is formed in a sealing portion of the case.
  • the two electrode tabs may be surrounded by an insulating member; the two electrode tabs and the insulating member may be located in an internal region of the stepped part; and outer portions of the insulating member may be formed in the sealing portion of the case outside of the stepped part.
  • each of the two electrode tabs may be respectively surrounded by an insulating member.
  • adjacent side edges of each of the insulating members between the two electrode tabs may overlap in the region of the stepped part.
  • the insulating members may be respectively wound on the two electrode tabs such that adjacent side edges contact; or, the insulating members may be wound on the two electrode tabs with their adjacent side edges being spaced apart; or, the insulating members may be wound on the two electrode tabs with their adjacent side edges being interlocked.
  • the two electrode tabs may be surrounded by one insulating member.
  • the insulating member may be a tape.
  • the two electrode tabs may be fixed in one combining member; the combining member may include tab holes through which the two electrode tabs extend; and the combining member may be made of an insulating material.
  • the two electrode tabs may be respectively attached to uncoated parts of two electrode plates of the electrode assembly.
  • FIG. 1 is an exploded perspective view illustrating a state before a pouch type lithium secondary battery is sealed
  • FIG. 2 is a perspective view illustrating a state after a pouch type lithium secondary battery according to an exemplary embodiment of the present invention is sealed;
  • FIG. 3 is a front view of FIG. 2 ;
  • FIG. 4 is a plan view of FIG. 2 ;
  • FIG. 5 is a view illustrating a state in which side edges of the protection tape wound on the electrode tab are contacted with each other;
  • FIG. 6 is a view illustrating a state in which side edges of the protection tape wound on the electrode tab are spaced from each other;
  • FIG. 7 is a view illustrating a state in which side edges of the protection tape wound on the electrode tabs are engaged with each other;
  • FIG. 8 is a magnification view of ‘VIII’ portion of FIG. 7 ;
  • FIG. 9 is a plan view illustrating a pouch type lithium secondary battery according to an exemplary embodiment of the present invention.
  • FIG. 10 is a view illustrating a state in which an electrode tab is attached to an electrode assembly.
  • FIG. 11 is a sectional view illustrating a state in which the electrode assembly is housed in a pouch case and sealed.
  • FIGS. 1 to 4 show a pouch type lithium secondary battery according to an exemplary embodiment of the present invention.
  • FIG. 1 is an exploded perspective view illustrating a state before a pouch case is sealed in a pouch type lithium secondary battery.
  • FIG. 2 is a perspective view illustrating a state after the pouch case is sealed.
  • FIG. 3 is a front view of FIG. 2 .
  • FIG. 4 is a plan view of FIG. 2 .
  • the pouch type lithium secondary battery 100 includes an electrode assembly 110 and a case 120 in which the electrode assembly 110 is sealed and housed.
  • the electrode assembly 110 includes a battery unit 111 , a cathode tab 112 and an anode tab 113 respectively connected to two electrodes of the battery unit 111 .
  • the battery unit 111 includes a cathode plate 116 , an anode plate 117 , and a separator 118 disposed between the cathode plate 116 and the anode plate 117 .
  • the battery unit 111 is assembled by interposing the separator 118 between the cathode plate 116 and the anode plate 117 and winding the cathode plate 116 , the anode plate 117 , and the separator 118 together.
  • the cathode plate 116 of the battery unit 111 is connected to the cathode tab 112
  • the anode plate 117 is connected to the anode tab 113 .
  • the cathode tab 112 and the anode tab 113 are respectively connected to external terminals (not shown). Protection tapes 114 and 115 are wound on the cathode tab 112 and the anode tab 113 respectively so as to insulate the cathode tab 112 and the anode tab 113 from the case 120 .
  • the case 120 includes a lower case 122 which houses the battery unit 111 , and an upper case 121 which seals an upper surface of the lower case 122 .
  • a sealing part 123 is formed on three edges about the periphery of the upper and lower cases 121 and 122 at which a seal is formed.
  • FIGS. 2 to 4 show the pouch type lithium secondary battery 100 in which the electrode assembly 110 is housed inside the case 120 and the case 120 is closed.
  • a stepped part 124 is formed corresponding to a portion at which the cathode tab 112 and the anode tab 113 extend through the sealing part 123 from the inside of the case 120 to the outside of the case 120 between the upper case 121 and the lower case 122 of the case 120 .
  • the stepped part 124 is formed in the sealing part 123 of the upper case 121 and the lower case 122 corresponding to the portion of the sealing part 123 through which both the cathode tab 112 and the anode tab 113 extend.
  • the stepped part 124 is shown as being oppositely formed in a central edge of the three edges about the periphery of the upper and lower cases 121 and 122 in which the seal is formed, the stepped part 124 is not limited thereto such the stepped part 124 may be formed in any one of the three edges about the periphery of the upper and lower cases 121 and 122 . Further, there need not be only three edges in which the seal is formed such that all of the periphery may be sealed in such a fashion.
  • the battery unit 111 is housed inside the lower case 122 , and the cathode tab 112 and the anode tab 113 are withdrawn outside the lower case 122 .
  • the upper case 121 seals the lower case 122 .
  • the cathode tab 112 and the anode tab 113 are wound with the protection tapes 114 and 115 at portions of the cathode tab 112 and the anode tab 113 which contact the upper and lower cases 121 and 122 and are sealed at the sealing part 123 .
  • the stepped part 124 is formed at the portion where the cathode tab 112 and the anode tab 113 are withdrawn.
  • the cathode tab 112 and the anode tab 113 are located together at the stepped part 124 .
  • the stepped part 124 is formed by pressing the withdrawn portion of the cathode tab 112 and the anode tab 113 in the sealing part 123 by upper and lower jigs after the sealing part 123 of the upper and lower cases 121 and 122 is sealed.
  • the stepped part 124 reduces concentration of pressure on regions corresponding to the cathode tab 112 and anode tab 113 , thereby reducing the danger of an electrical short between an externally exposed metal layer of the case 120 and the cathode tab 112 and the anode tab 113 .
  • a sealing pressure may be increased on the region of the sealing part 123 except for the stepped part 124 , thereby improving sealing safety of the sealing part 123 .
  • width D of the stepped part 124 formed on the sealing part 123 is wider than a distance D 1 between the outer edges of the cathode tab 112 and the anode tab 113 , thereby preventing an electrical short between the cathode and anode tabs 112 and 113 at the time of forming the stepped part 124 .
  • the width D of the stepped part 124 is formed so as to be narrower than a distance D 2 between outer edges of the protection tapes 114 and 115 , thereby allowing an error tolerance with regard to the setting position where the cathode and anode tabs 112 and 113 and the protection tapes 114 and 115 are withdrawn from the sealing part 123 and preventing sealing defects.
  • the cathode tab 112 is wound with the protection tape 114
  • the anode tab 113 is wound with the protection tape 115 . That is, the cathode and anode tabs 112 and 113 are withdrawn through the sealing part 123 and wound with the protection tapes 114 and 115 , and the cathode and anode tabs 112 and 113 are located in the region of the stepped part 124 together.
  • inside edges of the protection tapes 114 and 115 contact and overlap each other in the stepped part 124 .
  • the internal region of the stepped part 124 i.e., the region of the stepped part 124 between the cathode tab 112 and the anode tab 113 , is sealed by the overlapping protection tapes 114 and 115 .
  • the protection tapes 114 and 115 may be wound on the cathode and anode tabs 112 and 113 located in the stepped part 124 in various configurations.
  • FIGS. 5 to 8 show various modification examples of the type of the protection tape wound on the two electrode tabs.
  • FIG. 5 is a view illustrating a state in which inside edges of protection tapes 114 A and 115 A wound on the cathode tab 112 and the anode 113 tab contact each other.
  • FIG. 6 is a view illustrating a state in which inside edges of protection tapes 114 B and 115 B wound on the cathode tab 112 and the anode 113 tab are spaced apart from each other by a distance d.
  • FIG. 7 is a view illustrating a state in which inside edges of protection tapes 114 C and 115 C wound on the cathode tab 112 and the anode 113 tab are engaged with each other.
  • FIG. 8 is a magnification view of ‘VIII’ portion of FIG. 7 .
  • the protection tape 114 A and the protection tape 115 A surround the cathode tab 112 and the anode tab 113 respectively with their adjacent side edges contacting each other.
  • the two adjacent side edges i.e., the inside edges, contact each other in the state that the protection tapes are wound on the electrode tabs. Or, the adjacent side edges may be partially overlapped as described above with reference to FIGS. 3 and 4 .
  • the protection tapes 114 A and 115 A seal the internal region of the stepped part 124 .
  • the protection tapes 114 B and 115 B surround the cathode tab 112 and the anode tab 113 respectively with their adjacent side edges being spaced with the distance d.
  • the distance d is formed as a very fine gap because of the small width between the cathode and anode tabs 112 and 113 .
  • the stepped part 124 is formed at the sealing portion 123 and thus, the protection tapes 114 B and 115 B seal the internal region of the stepped part 124 .
  • a projection part 114 C′ of the protection tape 114 C and a projection part 115 C′ of the protection tape 115 C are formed so as to interlock between the protection tape 114 C of the cathode tab 112 and protection tape 115 C of the anode tab 113 . That is, the projection part 114 C′ and a groove part 114 C′′ are alternatively formed at an inside edge of the protection tape 114 C of the cathode tab 112 , and the projection part 115 C′ and a groove part 115 C′′ are alternatively formed at an inside edge of the protection tape 115 C of the anode tab 113 .
  • the projection part 114 C′ is inserted into the groove part 115 ′′, and the projection part 115 C′ is inserted into the groove part 114 C′′.
  • two facing side edges of the protection tapes 114 C and 115 C are engaged with each other in an interlocking shape.
  • a narrow and long path is formed in the region between adjacent side edges of the protection tape 114 C of the cathode tab 112 and protection tape 115 C of the anode tab 113 by the combination structure of the interlocking shape.
  • the sealing is completed even if only a part of the narrow and long path between the protection tapes 114 C and 115 C includes the interlocking shape.
  • FIG. 9 is a plan view illustrating a pouch type lithium secondary battery 200 according to an exemplary embodiment of the present invention.
  • the pouch type lithium secondary battery 200 is constructed so as to surround a cathode tab 212 and an anode tab 213 with one protection tape 214 .
  • a gap between the cathode and anode tabs 212 and 213 is constantly kept.
  • FIGS. 10 and 11 show other examples related to an example embodiment of the present invention.
  • FIG. 10 is a view illustrating a state in which an electrode tab is attached to a battery unit according to an example embodiment of the present invention.
  • FIG. 11 is a sectional view illustrating a pouch battery in which the electrode assembly assembled in FIG. 10 is housed in a pouch case and sealed.
  • a pouch type lithium secondary battery 300 is formed by disposing cathode and anode tabs 312 and 313 with one combining member 314 in advance.
  • the combining member 314 includes tab holes 314 a and 314 b passing through the rectangular body of the combining member 314 .
  • the cathode and anode tabs 312 and 313 respectively extend through the tab holes 314 a and 314 b .
  • the combining member 314 may be made of an insulating material.
  • a separator 316 is interposed between a cathode plate 315 and an anode plate 317 and then a battery unit 311 is wound. After winding of the battery unit 311 is finished, the cathode tab 312 is attached to an uncoated part of the cathode plate 315 , where an electrode active material is not formed on the cathode plate 315 . The anode tab 313 is attached to an uncoated part of the anode plate 316 on which an electrode active material is not formed.
  • cathode and anode tabs 312 and 313 are disposed in the combining member 314 in advance, a gap between the cathode and anode tabs 312 and 313 is constantly kept. Thus, disruption of the gap between the cathode and anode tabs 312 and 313 does not occur.
  • An electrode assembly 310 with the cathode and anode tabs 312 and 313 is received in a lower case 322 , and an upper case 321 is sealed to the lower case 322 .
  • the combining member 314 fixing the cathode and anode tabs 312 and 313 are sealed in the sealing portion 323 .
  • One stepped part 324 is formed in the sealing portion 323 , and thus, the combining member 314 is sealed in an internal region of the stepped part 324 .
  • the cathode and anode tabs 312 and 313 of the electrode assembly 310 are withdrawn in parallel through the sealing portion 323 of the case 320 during the receiving process in the lower case 322 of the case 320 .
  • the cathode and anode tabs 312 and 313 are attached to an outermost part of the battery unit 311 . Accordingly, there is an advantage in that it is easy to control positions of the cathode and anode tabs 312 and 313 when the electrode assembly 310 is received in the lower case 321 .
  • workability of attaching the electrode tab to the electrode plate is improved in the short width type battery.
  • sealing is improved at the sealing portion of the electrode tab and case in sealing of the upper and lower cases. Further, it is easy to control the position of the electrode tabs in the state in which the electrode assembly is housed in the case.
  • the pouch type lithium secondary battery according to aspects of the present invention produces the following and/or other effects: First, the quality of the sealing portion of the pouch case where the electrode tabs are withdrawn is stabilized, thereby improving reliability of the secondary battery. Second, workability of assembling and sealing process of the battery is improved, thereby improving efficiency of a manufacturing process.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
US12/054,752 2007-07-19 2008-03-25 Pouch type lithium secondary battery Active 2030-01-10 US8313857B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/655,253 US8623547B2 (en) 2007-07-19 2012-10-18 Pouch type lithium secondary battery

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR2007-72187 2007-07-19
KR1020070072187A KR100917734B1 (ko) 2007-07-19 2007-07-19 파우치형 리튬 이차전지
KR10-2007-0072187 2007-07-19

Related Child Applications (1)

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US13/655,253 Continuation US8623547B2 (en) 2007-07-19 2012-10-18 Pouch type lithium secondary battery

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US20090023062A1 US20090023062A1 (en) 2009-01-22
US8313857B2 true US8313857B2 (en) 2012-11-20

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US12/054,752 Active 2030-01-10 US8313857B2 (en) 2007-07-19 2008-03-25 Pouch type lithium secondary battery
US13/655,253 Active US8623547B2 (en) 2007-07-19 2012-10-18 Pouch type lithium secondary battery

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US13/655,253 Active US8623547B2 (en) 2007-07-19 2012-10-18 Pouch type lithium secondary battery

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US (2) US8313857B2 (de)
EP (1) EP2017908B1 (de)
JP (1) JP5512088B2 (de)
KR (1) KR100917734B1 (de)
CN (1) CN101350433B (de)

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CN113690550A (zh) * 2021-07-14 2021-11-23 东莞新能源科技有限公司 电芯、电池以及用电设备

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US20090023062A1 (en) 2009-01-22
JP5512088B2 (ja) 2014-06-04
JP2009026739A (ja) 2009-02-05
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US8623547B2 (en) 2014-01-07
KR20090008869A (ko) 2009-01-22
CN101350433B (zh) 2012-01-18

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